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<title>PREDOM: Predominance area diagrams</title>
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    <a href="SP_0_Main.htm"><img src="images/abacus.gif" border="0" width="32" height="32" alt="Calc." title="Calc."></a>&nbsp;</td>
    <td align="left" valign="middle"><font size="-1"><a href="SP_0_Main.htm">SED &amp; PREDOM</a></font></td>
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<h2>PREDOM: Predominance Area Diagrams</h2>

<h3>Introduction</h3>

<p>PREDOM is a program to calculate and draw
<a href="SP_Diagr_Predom.htm">predominance area diagrams</a>. Such a
diagram shows which of the aqueous species, that are formed by a
given &#147;main&#148; component (usually a metal cation), dominate
at a given point (i.e., at given concentrations of the &#147;ligand&#148; components).
For <i>solid phases</i>, a predominance area diagram shows the range of existence for
solids formed by the &#147;main&#148; component. Therefore, it shows
where a solid phase is thermodynamically stable (even if the amount of solid
formed at equilibrium is perhaps very small).</p>

<p>This program can draw diagrams with either <nobr>log<i>(Tot.Conc.)</i></nobr> or
<nobr>log<i>(activity)</i></nobr> as variables in the axes.</p>
<ul>
<li><a href="SP_PREDOM_How.htm">Calculation method</a></li>
<li><a href="SP_PREDOM_Input_File_Format.htm">Format of input data-file</a></li>
<li><a href="SP_Plot-File_Format.htm">Output plot-file format</a></li>
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